package org.bouncycastle.jce.provider;
import java.security.InvalidKeyException;
import java.security.PrivateKey;
import java.security.PublicKey;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECPrivateKeyParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.jce.interfaces.ECPrivateKey;
import org.bouncycastle.jce.interfaces.ECPublicKey;
import org.bouncycastle.jce.spec.ECParameterSpec;
/**
* utility class for converting jce/jca ECDSA, ECDH, and ECDHC
* objects into their org.bouncycastle.crypto counterparts.
*/
public class ECUtil
{
static public AsymmetricKeyParameter generatePublicKeyParameter(
PublicKey key)
throws InvalidKeyException
{
if (key instanceof ECPublicKey)
{
ECPublicKey k = (ECPublicKey)key;
ECParameterSpec s = k.getParams();
return new ECPublicKeyParameters(
k.getQ(),
new ECDomainParameters(s.getCurve(), s.getG(), s.getN()));
}
throw new InvalidKeyException("can't identify EC public key.");
}
static public AsymmetricKeyParameter generatePrivateKeyParameter(
PrivateKey key)
throws InvalidKeyException
{
if (key instanceof ECPrivateKey)
{
ECPrivateKey k = (ECPrivateKey)key;
ECParameterSpec s = k.getParams();
return new ECPrivateKeyParameters(
k.getD(),
new ECDomainParameters(s.getCurve(), s.getG(), s.getN()));
}
throw new InvalidKeyException("can't identify EC private key.");
}
}